Incandescent-lamp socket



(No Model.)

W. L. SILVBY. INGAJNDESGENT LAMP SOCKET.

Patented Feb. 2, 1892.

JEu/ea ton efltte s t. 69%

UNITED STATES PATENT OFFICE.

\VILLIAM L. SILVE Y, OF LIMA, OllIO.

lNCANDESCENT-LAMP SOCKET.

SPECIFICATION forming part of Letters Patent No. 467,958, dated February2, 1892. Application filed May 17, 1889. Serial No. 311,196. (No model.)

To an whom it may concern..-

Be it known that 1, WILLIAM L. SILVEY, a resident of Lima, in the countyof Allen and State of Ohio, have invented certain new and usefulImprovements in Incandescent-Lamp Sockets, of which the following is aspecification.

'My invention relates, principally, to that class of sockets or holdersin which there is a double make and break in the circuit when the key isturned, at the same time to make an apparatus that is strong and simple,not liable to get out oforder, and one to which a lamp is easilyattached.

Referring to the accompanying drawings, which are made a part hereof, inwhich similar letters refer to similar parts, Figure 1 is a full-sizedview of the holder with the lamp attached and showing the thumb-key Dwith the distinguishing-mark S cast therein. Fig. 2 is avertico-longitudinal view of the working mechanism, looking from therear or lefthand side. Fig. 3 is a sectional View of the globe f and capC along the same sectional line as in Fig. 2. Fig. 4 is a verticalsection of Fig. 2 along the dotted line 00 06, showing the key D turnedso that the lamp is switched off. Fig. 5 is the same mechanism as shownin Fig. 4, except in this view the, key D is turned so that thelamp-circuit is closed. Fig. 6 shows a front View of the workingmechanism in order to show the attachment of the circuit-wires w. Fig. 7is a top View of the cap 0, showing the parts in position; and Fig.

8 shows the switch-block d with the circuitclosing' pins (1 in position,shown partly by dotted lines.

The frame-work of the machine consists of a piece of Vulcanized rubberor fiber or other insulating substance a, about one and one-half incheslong, one inch wide, and one-fourth inch thick. The upper part of thispiece of material has a piece milled out of it about three-eighths inchwide and extending down into the body of the piece about three-fourthsof an inch. hen this has been done, the material has nearly the shape ofthe letter U, the two limbs extending upward. There is now a small notchmilled out of the lower end for the reception of the L-shaped attachmentpiece E. This piece is let into the fiber to keep it steady, but as afurther help it is held firmly'against the side of the fiber plate bytwo screws. These screws also serve to-hold one end of the flat spring 9On the opposite side of the fiber frame a is attached a second spring gby two screws, which pass through a wing and are tapped into it at oneside, as shown in Fig.6. On the same side is a second spring g, whichserves to make electrical contact between one end of the leadingin wiresand the ring 1, secured in the lampcap. One side of the lamp-wires isalso attached to the ring 1- and the other to a centrally-locatedscrew-stud c. This screw-stud e is flattened, so that it will not turnin the insulating material S, which is preferably cast around it and thering 7". This insulating material is preferably cement, brimstone, orsome substance of a like nature that will become liquid and afterwardharden. However, it may be other substances that will be pressed in byhydraulic pressure, as it is necessary that the parts be substantial.The cap when finished is attached to the globe f in the ordinary way bya mixture of plaster-of-paris or other substance that will harden whenit dries. The lamp f and cap 0 are attached to the socket by the stem e,which is screwed into the L-shaped plate E in threaded hole 6 and turnedup until the ring 0' and the spring g come into a firm rubbing contact,when both sides of the lamp-circuit are closed. Into the milled slot inthe upper part of the fiber (L a small block (1 is mounted and free toturn on a small squared stenrD', to which a thumb plate D is attached.This small insulatingblock (I, in addition to having the central holethrough which the rotative stud D passes, also has two holes drilled atright angles to the first, into which two pieces of wire (1 are drivenand turned down at the points, as shown in Fig. 8. The office of thissmall block is to open and close the electrical circuit, thereby turningon or off the electric current into the globe and filament. By rotatingthe key so that this fiber block stands as shown in Fig. 4 thecontinuity of the electric circuit is broken and there is no light; butby turning the key as shown in Figs. 1, 2, 4, and 5 the electriccircuitis closed and the lamp will burn.

I will now describe the flow of the current. The electric circuit beingclosed, as shown in Fig. 5, the current enters at the positive Wire '10,passes thence to the contact-spring g, thence to the ring 7' and carbonfilament, thence by screw-stem e to L-plate, thence to flat spring g,.thenoe to the insulating contact-block and contact-studs (Z d, thenceto spring g, to outgoing WllGZU, called the negative wire, and out.Should it become desirable to turn off the light, the key is turned tostand crosswise, as shown in Fig. 4, and the continuity of the circuitis broken at the two contact-springs g and g This breaking the circuitat the two points prevents forming an are, which tends to wear away themetal, and consequently I reduce the liability of the apratus gettingout of order to a minimum, the object all along having been to make avery effective and at the same time a very simple apparatus. After allthe parts are properly assembled there is attached a cap B for attaching the holder to an electrolier or other fixture, and a case A, ofa plain but-neat design, for covering up the entire working mechanismand preventing it from being injured and to keep the dirt and dust away.

Having fully described my invention, What I claim asnew, and wish tosecure by Letters Patent of the United States, is

The combination, with an incandescentlamp globe f, of the cap consistingof the parts C S '0" e, mounted on and forming a cap thereto, the holderor socket consisting of the cap B, case A, lJ-shaped insulating-piece a,to which are secured the springs g g 9 L-shaped screw-plate E, and keyand stud D D, on which the block d andstuds d are mounted and wherebythey are rotated, as specified.

KVILLIAM SILYEY.

\Vitnesses:

J. H. Rose, R. ,O. WARNER.

